<!DOCTYPE html>
<html>
    <head>
        <title>Example</title>
        <!-- 重要样式标记 !important -->
        <style type="text/css">
            a {
                color: black !important;
            }
        </style>
    </head>
    <body>
        <!-- 效果是黑色, 不是红色 -->
        <a href="http://apress.com" style="color: red">
            Visit the Apress website
        </a>
        <p>I like <span>apples</span> and oranges.</p>
        <a href="http://w3c.org">Visit the W3C website</a>
    </body>
</html>